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What is the difference between good cholesterol and bad cholesterol?

HDL (high-density lipoprotein) cholesterol is considered to be the good cholesterol. It's called "high-density" because it has a high amount of protein and not very much fat.

The HDL molecules find excess cholesterol in the blood stream and carry it back to the liver for disposal. This is why it is good. If HDL levels are too low, it means there aren't enough around to carry away excess cholesterol.

LDL cholesterol is the bad cholesterol; it's "low density" because it has a low amount of protein and a lot of fat. The LDL molecules carry cholesterol from the liver to the other parts of the body, and if there are too many of them, they store the cholesterol and fat in various arteries throughout the body. When there is too much of it, it constantly builds up in the walls of your arteries until a blockage occurs. This is why it is bad. If LDL levels are too high, it means that too much cholesterol is being transported and deposited in your arteries, and you will be at risk for heart disease.

What is a fisheye lens?

In photography, a fisheye lens is a wide-angle lens that takes in an extremely wide, hemispherical image. Originally developed for use in meteorology and astronomy and called "whole-sky lenses", fisheye lenses quickly became popular in general photography for their unique, distorted appearance. They are often used by photographers shooting broad landscapes to suggest the curve of the Earth. Hemispherical photography is used for various scientific purposes to study plant canopy geometry and to calculate near-ground solar radiation.

There are two types of fisheye lens- circular and full frame. The first types of fisheye lenses to be developed were "circular fisheyes" — lenses which took in a 180° hemisphere and projected this as a circle within the film frame.

As fisheye lenses gained popularity in general photography, camera companies began manufacturing fisheye lenses that enlarged the image circle to cover the entire 35 mm film frame, and this is the type of fisheye most commonly used by photographers.

The first full-frame fisheye lens to be mass-produced was a 16 mm lens made by Nikon in the late 1960s. Digital cameras with APS-C sized sensors require a 10.5 mm lens to get the same effect as a 16 mm lens on a camera with full-frame sensor.[2]

What is a dumdum bullet?

In the field of firearms, an expanding bullet is a bullet designed to expand on impact. Such bullets are often known as Dum-dum or dumdum bullets. There are several types of dum-dum designs. Two popular designs are the hollow point (made during the manufacturing phase) and X-ing made usually by the user by making two notches perpendicular to each other on the tip of the bullet, commonly with a knife. The effect is that the bullet deforms and sometimes fragments upon impact due to the indentations. This creates a larger wound channel or channels with greater blood loss and trauma.

In the late 19th century, the invention of Cordite ammunition permitted higher velocity than black powder, and corresponding higher hit probabilities. However to limit the amount of recoil to an acceptable level meant that higher velocity rounds needed lighter (and thus smaller diameter) bullets. Originally, dum-dum referred to a new type of ammunition produced in the early 1890s at the arsenal in Dum Dum near Calcutta India.

What is the difference between a performer and an actor?

All actors are performers but all performers are not actors! Acting is a type of performance one can give. Other types of performers include dancers, jugglers, acrobats, etc. All of these performers need not know how to act. And that is the main difference between an actor and a performer.